feat: add initial impl of efi-stub and kernel

arch/x86/boot/.gitignore

@@ -0,0 +1 @@
+offset.h

arch/x86/boot/build.zig

@@ -0,0 +1,86 @@
+const std = @import("std");
+const kernel_build = @import("../../../kernel/build.zig");
+const Step = std.Build.Step;
+
+pub fn buildSetup(b: *std.Build, target: std.Build.ResolvedTarget, optimize: std.builtin.OptimizeMode, kcapsule: *Step.Compile) *Step.Compile {
+    const offset_generate = b.addSystemCommand(&[_][]const u8{
+        "sh",
+        "arch/x86/boot/helper.sh",
+        "generate_offset_header",
+    });
+    offset_generate.addFileArg(kcapsule.getEmittedBin());
+    offset_generate.step.dependOn(&kcapsule.step);
+    const setup = b.addExecutable(.{
+        .name = "setup",
+        .use_lld = true,
+        .use_llvm = true,
+        .root_module = b.createModule(.{
+            .root_source_file = b.path("arch/x86/boot/setup/stage1.zig"),
+            .target = target,
+            .optimize = optimize,
+        }),
+    });
+    setup.step.dependOn(&offset_generate.step);
+    setup.step.addWatchInput(b.path("arch/x86/boot/offset.h")) catch {};
+    setup.addAssemblyFile(b.path("arch/x86/boot/header.S"));
+    setup.addIncludePath(b.path("include"));
+    setup.addIncludePath(b.path("arch/x86/boot"));
+    setup.setLinkerScript(b.path("arch/x86/boot/setup.ld"));
+    return setup;
+}
+pub fn buildKcapsule(b: *std.Build, target: std.Build.ResolvedTarget, optimize: std.builtin.OptimizeMode) *Step.Compile {
+    const kernel = kernel_build.buildKernelBin(b, target, optimize);
+    const kcapsule = b.addExecutable(.{
+        .name = "kcapsule",
+        .use_lld = true,
+        .use_llvm = true,
+        .root_module = b.createModule(.{
+            .root_source_file = b.path("arch/x86/boot/extractor.zig"),
+            .target = target,
+            .optimize = optimize,
+            .pic = true,
+        }),
+    });
+    const efi_target = b.resolveTargetQuery(.{
+        .cpu_arch = .x86_64,
+        .os_tag = .freestanding,
+        .abi = .msvc,
+    });
+    const efi_loader = b.addObject(.{
+        .name = "efi_loader",
+        .use_lld = true,
+        .use_llvm = true,
+        .root_module = b.createModule(.{
+            .root_source_file = b.path("drivers/firmware/efi/x86.zig"),
+            .target = efi_target,
+            .optimize = optimize,
+            .pic = true,
+        }),
+    });
+    kcapsule.pie = true;
+    kcapsule.entry = .{ .symbol_name = "efi_pe_entry" };
+    kcapsule.addObject(efi_loader);
+    kcapsule.addAssemblyFile(b.path("arch/x86/boot/payload.S"));
+    kcapsule.setLinkerScript(b.path("arch/x86/boot/kcapsule.ld"));
+    kcapsule.step.dependOn(&kernel.step);
+
+    return kcapsule;
+}
+pub fn buildImage(b: *std.Build, optimize: std.builtin.OptimizeMode) *Step {
+    const target = b.resolveTargetQuery(.{ .cpu_arch = .x86_64, .os_tag = .freestanding, .abi = .none });
+
+    const kcapsule = buildKcapsule(b, target, optimize);
+    const setup = buildSetup(b, target, optimize, kcapsule);
+    const image = b.addSystemCommand(&[_][]const u8{
+        "sh",
+        "arch/x86/boot/helper.sh",
+        "build_image",
+    });
+
+    image.addFileArg(setup.getEmittedBin());
+    image.addFileArg(kcapsule.getEmittedBin());
+    image.step.dependOn(&setup.step);
+    image.step.dependOn(&kcapsule.step);
+
+    return &image.step;
+}

arch/x86/boot/header.S

@@ -0,0 +1,86 @@
+#include "format/pe.h"
+#include "offset.h"
+    .set salign, 0x1000
+    .set falign, 0x200
+    .section ".bstext", "ax" // allocatable, executable
+    .word IMAGE_DOS_SIGNATURE
+    .org 0x3c
+    .long pe_header
+    .global pe_header
+pe_header:
+    .long IMAGE_NT_SIGNATURE
+coff_header:
+    .word IMAGE_FILE_MACHINE_AMD64
+    .word section_count
+    .long 0                      /* TimeDateStamp */
+    .long 0                      /* PointerToSymbolTable */
+    .long 0                      /* NumberOfSymbols */
+    .word section_table - optional_header /* SizeOfOptionalHeader */
+    .word IMAGE_FILE_EXECUTABLE_IMAGE | IMAGE_FILE_DEBUG_STRIPPED | IMAGE_FILE_LINE_NUMS_STRIPPED /* Characteristics */
+optional_header:
+    .word IMAGE_NT_OPTIONAL_HDR64_MAGIC /* Magic */
+    .byte 0                        /* MajorLinkerVersion */
+    .byte 0                        /* MinorLinkerVersion */
+    .long CAP__data               /* SizeOfCode */
+    .long CAP__end - CAP__data   /* SizeOfInitializedData */
+    .long 0                        /* SizeOfUninitializedData */
+    .long setup_size + efi_pe_entry   /* AddressOfEntryPoint */
+    .long setup_size               /* BaseOfCode */
+extra_header_fields:
+    .quad 0                        /* ImageBase */
+    .long salign                   /* SectionAlignment */
+    .long falign                   /* FileAlignment */
+    .word 0                        /* MajorOperatingSystemVersion */
+    .word 0                        /* MinorOperatingSystemVersion */
+    .word 0                        /* MajorImageVersion */
+    .word 0                        /* MinorImageVersion */
+    .word 0                        /* MajorSubsystemVersion */
+    .word 0                        /* MinorSubsystemVersion */
+    .long 0                        /* Win32VersionValue */
+
+    .long setup_size + CAP__end       /* SizeOfImage */
+
+    .long salign                   /* SizeOfHeaders */
+    .long 0                        /* CheckSum */
+    .word IMAGE_SUBSYSTEM_EFI_APPLICATION /* Subsystem */
+    .word IMAGE_DLLCHARACTERISTICS_NX_COMPAT /* DllCharacteristics */
+    .quad 0                        /* SizeOfStackReserve */
+    .quad 0                        /* SizeOfStackCommit */
+    .quad 0                        /* SizeOfHeapReserve */
+    .quad 0                        /* SizeOfHeapCommit */
+    .long 0                        /* LoaderFlags */
+    .long (section_table - .) / 8  /* NumberOfRvaAndSizes */
+    .quad 0
+    .quad 0
+    .quad 0
+    .quad 0
+    .quad 0
+    .quad 0
+
+section_table:
+    # .ascii ".setup\0\0"
+    # .long setup_size - salign  /* VirtualSize */
+    # .long salign               /* VirtualAddress */
+    # .long setup_size - salign  /* SizeOfRawData */
+    # .long salign               /* PointerToRawData */
+    # .long 0,0,0
+    # .long IMAGE_SCN_CNT_INITIALIZED_DATA | IMAGE_SCN_MEM_READ | IMAGE_SCN_MEM_DISCARDABLE
+
+    .ascii ".text\0\0\0"
+    .long text_size            /* VirtualSize */
+    .long setup_size           /* VirtualAddress */
+    .long text_size            /* SizeOfRawData */
+    .long setup_size           /* PointerToRawData */
+    .long 0,0,0
+    .long IMAGE_SCN_CNT_CODE | IMAGE_SCN_MEM_READ | IMAGE_SCN_MEM_EXECUTE
+
+    .ascii ".data\0\0\0"
+    .long CAP__end - CAP__data     /* VirtualSize */
+    .long setup_size + CAP__data    /* VirtualAddress */
+    .long CAP__edata - CAP__data /* SizeOfRawData */
+    .long setup_size + CAP__data    /* PointerToRawData */
+    .long 0,0,0
+    .long IMAGE_SCN_CNT_INITIALIZED_DATA | IMAGE_SCN_MEM_READ | IMAGE_SCN_MEM_WRITE
+    
+    .set text_size, CAP__data
+    .set section_count, (. - section_table) / 40

arch/x86/boot/helper.sh

@@ -0,0 +1,30 @@
+#!/bin/bash
+
+generate_offset_header() {
+    echo "processing $1"
+    nm -n "$1" \
+    | grep -e ' _\(end\|edata\|data\)$' \
+    | awk '{print "#define CAP_" $3 " 0x" $1}' \
+    > arch/x86/boot/offset.h
+    nm -n "$1" \
+    | grep -e ' efi_pe_entry$' \
+    | awk '{print "#define efi_pe_entry 0x" $1}' \
+    >> arch/x86/boot/offset.h
+}
+build_image() {
+    echo "building image from $1 and $2"
+    (dd if=$1 bs=4k conv=sync; cat $2) > yukiImage
+}
+# Main dispatcher
+case "$1" in
+    generate_offset_header)
+        generate_offset_header "$2"
+        ;;
+    build_image)
+        build_image "$2" "$3"
+        ;;
+    *)
+        echo "Usage: $0 {generate_offset_header|build_image} [args...]"
+        exit 1
+        ;;
+esac

arch/x86/boot/kcapsule.ld

@@ -0,0 +1,60 @@
+OUTPUT_ARCH(i386:x86_64)
+SECTIONS {
+    . = 0x1000;
+    .text : {
+        _text = .;
+        *(.text)
+        *(.text.*)
+        _etext = .;
+    }
+    .rodata : {
+        _rodata = .;
+        *(.rodata)
+        *(.rodata.*)
+        _erodata = .;
+    }
+    . = ALIGN(0x1000);
+    .data : {
+        _data = .;
+        *(.data)
+        *(.data.*)
+        . = ALIGN(0x1000);
+        _edata = .;
+    }
+    .bss : {
+        _bss = .;
+        *(.bss)
+        *(.bss.*)
+        *(COMMON)
+        _ebss = .;
+    }
+
+    .pgtable : {
+        _pgtable = .;
+        *(.pgtable)
+        _epgtable = .;
+    }
+
+    . = ALIGN(0x1000);
+    _end = .;
+	.got.plt (INFO) : {
+		*(.got.plt)
+    }
+	ASSERT(SIZEOF(.got.plt) == 0 ||
+            SIZEOF(.got.plt) == 0x18,
+            "Unexpected GOT/PLT entries detected!")
+
+    /*
+    * Sections that should stay zero sized, which is safer to
+    * explicitly check instead of blindly discarding.
+    */
+    .got : {
+        *(.got)
+    }
+    ASSERT(SIZEOF(.got) == 0, "Unexpected GOT entries detected!")
+
+    .plt : {
+        *(.plt) *(.plt.*)
+    }
+    ASSERT(SIZEOF(.plt) == 0, "Unexpected run-time procedure linkages detected!")
+}

arch/x86/boot/setup.ld

@@ -0,0 +1,28 @@
+OUTPUT_FORMAT(binary)
+OUTPUT_ARCH(i386)
+ENTRY(_start)
+
+SECTIONS {
+    . = 0;
+    
+    .bstext : {
+        *(.bstext)
+        . = 495;
+    } =0xffffffff
+    .text : {*(.text .text.*)}
+    . = ALIGN(16);
+    .rodata : {*(.rodata .rodata.*)}
+    . = ALIGN(16);
+    .data : {*(.data .data.*)}
+
+    setup_size = ALIGN(ABSOLUTE(.), 4096);
+
+    . = ALIGN(16);
+    .bss : {*(.bss) }
+    . = ALIGN(16);
+    
+    /DISCARD/ : {
+        *(.note*)
+    }
+
+}